feat: add join confirmation and mail templating

config/config.exs

@@ -89,6 +89,10 @@ config :mv, MvWeb.Endpoint,
 # at the `config/runtime.exs`.
 config :mv, Mv.Mailer, adapter: Swoosh.Adapters.Local
 
+# Default mail "from" address for transactional emails (join confirmation,
+# user confirmation, password reset). Override in config/runtime.exs from ENV.
+config :mv, :mail_from, {"Mila", "noreply@example.com"}
+
 # Configure esbuild (the version is required)
 config :esbuild,
   version: "0.17.11",

config/runtime.exs

@@ -219,6 +219,10 @@ if config_env() == :prod do
 
   # ## Configuring the mailer
   #
+  # Transactional emails (join confirmation, user confirmation, password reset) use
+  # the sender from config :mv, :mail_from. Override in production if needed:
+  #   config :mv, :mail_from, {System.get_env("MAIL_FROM_NAME", "Mila"), System.get_env("MAIL_FROM_EMAIL", "noreply@example.com")}
+  #
   # In production you need to configure the mailer to use a different adapter.
   # Also, you may need to configure the Swoosh API client of your choice if you
   # are not using SMTP. Here is an example of the configuration: